Angular transducer unit and method for its manufacture, as well as angular switching device and device for the detection of objects

Abstract

The present invention relates to a method for the manufacture of a transducer unit for an angular switching device, in which a transducer element is inserted and fixed in an angled bush. The inventive method is characterized in that the transducer element is brought into aligned engagement with a transducer receptacle formed in a tool, that subsequently for the precise positioning with respect to the transducer element the bush is brought into an aligned, at least partial positive engagement with a bush receptacle appropriately constructed in the tool and that for completing the transducer unit the transducer element is fixed in the bush. In further aspects the invention relates to an angular transducer unit, an angular switching device and an object detection device.

1. Method for the manufacture of an angular transducer unit for an angular switching device, comprising:
 inserting and fixing a transducer element in an angled bush, wherein the angled bush comprises a tubular component having an axial direction and an opening opening transversely to the axial direction for receiving the transducer element, the inserting and fixing of the transducer element in the angled bush comprising:
 bringing the transducer element into aligned engagement with a transducer receptacle in a tool, 
 inserting or engaging a bush centring device in a body of the tool to form a bush receptacle, 
 bringing the bush into an aligned, at least partial engagement with the bush receptacle in the tool, to position the bush with respect to the transducer element, 
 fixing the transducer element in the bush, and 
 at least partially forming the transducer receptacle by inserting or engaging a transducer centring device in the tool body. 
 
 
     
     
       2. Method according to  claim 1 , further comprising fixing the transducer element relative to the tool. 
     
     
       3. Method according to  claim 2 , wherein the fixing of the transducer element is provided using at least one of: vacuum, adhesives, adhesive tapes, or magnets. 
     
     
       4. Method according to  claim 1 , further comprising fixing the transducer centring device relative to the tool body. 
     
     
       5. Method according to  claim 1 , further comprising fixing the bush centring device relative to the tool body. 
     
     
       6. Method according to  claim 4 , wherein the fixing of the transducer centring device is provided using at least one of: adhesives, adhesive tapes, vacuum, or magnets. 
     
     
       7. Method according to  claim 5 , wherein the fixing of the bush centring device is provided using at least one of: adhesives, adhesive tapes, vacuum, or magnets. 
     
     
       8. Method according to  claim 3 , further comprising sucking the transducer element onto the tool by means of at least one vacuum duct in the tool body. 
     
     
       9. Method according to  claim 8 , wherein a pressure compensation takes place on radially outer areas of the sucked on transducer element by means of compensating ducts in the tool body. 
     
     
       10. Method according to  claim 1 , further comprising removing the transducer centring device prior to fixing the transducer element in the bush. 
     
     
       11. Method according to  claim 1 , wherein the fixing of the transducer element in the bush is provided by at least partly filling gaps with at least one of: foam or moulding material. 
     
     
       12. Method according to  claim 1 , wherein use is made of a tool with steps, which as a stop engages with at least one of: a front end or a setback shoulder of the bush. 
     
     
       13. Method according to  claim 1 , further comprising manufacturing several transducer units in parallel using a plurality of transducer receptacles and bush receptacles. 
     
     
       14. Method according to  claim 1 , further comprising fixing the bush relative to the tool. 
     
     
       15. Method according to  claim 14 , wherein the fixing of the bush is provided using a holder provided on the tool. 
     
     
       16. Method according to  claim 1 , further comprising inserting and fixing several transducer elements in the angled bush. 
     
     
       17. Method according to  claim 1 , further comprising pressing a shielding can into the bush. 
     
     
       18. Method according to  claim 17 , further comprising fixing the shielding can to a printed circuit board. 
     
     
       19. Method according to  claim 18 , further comprising soldering the shielding can to the printed circuit board. 
     
     
       20. Method according to  claim 17 , further comprising soldering the transducer unit to the shielding can. 
     
     
       21. Method according to  claim 18 , further comprising soldering the transducer unit to the shielding can. 
     
     
       22. Method according to  claim 20 , further comprising soldering the transducer unit to the shielding can by means of at least one clip provided thereon. 
     
     
       23. Method according to  claim 1 , further comprising bringing the bush into at least one of: a positive, a non-positive engagement, or a locking engagement with a printed circuit board.